gh: add the PR workflow

.github/workflows/pr.yml

@@ -0,0 +1,73 @@
+name: PR Tests
+
+on:
+  pull_request:
+    branches:
+      - main
+  workflow_dispatch:
+
+jobs:
+  dependencies:
+    runs-on: ubuntu-latest
+
+    container:
+      image: node:18
+
+    strategy:
+      matrix:
+        node-version: [18.x]
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - name: Cache node modules
+        uses: actions/cache@v1
+        with:
+          path: node_modules
+          key: node_modules-${{ hashFiles('**/yarn.lock') }}
+
+      - name: Install yarn
+        run: npm install -g yarn
+
+      - name: Install dependencies
+        run: yarn install
+
+  lint:
+    runs-on: ubuntu-latest
+    needs: dependencies
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Load node modules
+        uses: actions/cache@v1
+        with:
+          path: node_modules
+          key: node_modules-${{ hashFiles('**/yarn.lock') }}
+
+      - name: Code passes lint check
+        run: yarn lint
+
+  test:
+    runs-on: ubuntu-latest
+    needs: dependencies
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Load node modules
+        uses: actions/cache@v1
+        with:
+          path: node_modules
+          key: node_modules-${{ hashFiles('**/yarn.lock') }}
+
+      - name: All Tests pass
+        run: yarn test